Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c7b378473f6097…

MALICIOUS

PDF

93.7 KB Created: 2021-03-29 21:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ef403f565ee9af1ae8cee2f7094f1180 SHA-1: 84dc61aae7e11df344fd5b9faa692c2506815f8e SHA-256: 40c7b378473f60978c9897b4ee92029e01bd04671d84c13991e27ac7636973a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, indicating a link farm designed to drive traffic to various websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=clickfree+hd325+manual PDF link annotation
    • https://cdn.sqhk.co/viforoge/62rjcZp/traditional_spinning_top_3d_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcff5094c46a.pdfIn PDF document text
    • https://pamenusunawot.weebly.com/uploads/1/3/4/0/134041165/vemuxawopedebekugoru.pdfIn PDF document text
    • https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/jozuvofu_bukanim_vamutumo.pdfIn PDF document text
    • https://cdn.sqhk.co/fepixuzutol/ifjj2ic/joplin_high_school_number_of_students.pdfIn PDF document text
    • https://xiduxerajul.weebly.com/uploads/1/3/4/6/134696605/225557.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/2365670.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/gcghia4/xbox_series_s_vs_xbox_one_s.pdfIn PDF document text
    • http://kezinogirojosev.iblogger.org/japow.pdfIn PDF document text
    • https://cdn.sqhk.co/temududote/bjS8ghR/76595455530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fef67960ebf4.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/lRfxjeC/our_solar_system_is_part_of_which_galaxy.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/jbjfihc/extreme_car_driving_simulator_2015_hack_apk.pdfIn PDF document text
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/4256435.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumuwejonalar.epizy.com/16901133220.pdfIn PDF document text
    • http://sevejegizala.rf.gd/blast_furnace_nptel.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/attestation_d_hbergement_prefecture_nanterre.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/jujew.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/idle_heroes_guide_2018.pdfIn PDF document text
    • http://riwasepe.epizy.com/ontology_computer_science.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 5472 bytes
SHA-256: 94b83dc9c907bed5617a2d5c230d6f074254fc68c6fdfd6997515681fa8c6396
font_01_sfnt_off00013f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F76 12072 bytes
SHA-256: e9135279e9ee664af25179cf65bf6258e0fd1e429f2c34291441fc835664ff1a

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